/*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SKSL_FUNCTIONCALL
#define SKSL_FUNCTIONCALL

#include "src/sksl/SkSLDefines.h"
#include "src/sksl/SkSLPosition.h"
#include "src/sksl/ir/SkSLExpression.h"
#include "src/sksl/ir/SkSLIRNode.h"

#include <cstdint>
#include <memory>
#include <string>
#include <utility>

namespace SkSL {
class Context;
class FunctionDeclaration;
class Type;
enum class OperatorPrecedence : uint8_t;

/* *
 * A function invocation.
 */
class FunctionCall final : public Expression {
public:
    inline static constexpr Kind kIRNodeKind = Kind::kFunctionCall;

    FunctionCall(Position pos, const Type *type, const FunctionDeclaration *function, ExpressionArray arguments)
        : INHERITED(pos, kIRNodeKind, type), fFunction(*function), fArguments(std::move(arguments))
    {}

    // Resolves generic types, performs type conversion on arguments, determines return type, and
    // reports errors via the ErrorReporter.
    static std::unique_ptr<Expression> Convert(const Context &context, Position pos,
        const FunctionDeclaration &function, ExpressionArray arguments);

    static std::unique_ptr<Expression> Convert(const Context &context, Position pos,
        std::unique_ptr<Expression> functionValue, ExpressionArray arguments);

    // Creates the function call; reports errors via ASSERT.
    static std::unique_ptr<Expression> Make(const Context &context, Position pos, const Type *returnType,
        const FunctionDeclaration &function, ExpressionArray arguments);

    static const FunctionDeclaration *FindBestFunctionForCall(const Context &context,
        const FunctionDeclaration *overloads, const ExpressionArray &arguments);

    const FunctionDeclaration &function() const
    {
        return fFunction;
    }

    ExpressionArray &arguments()
    {
        return fArguments;
    }

    const ExpressionArray &arguments() const
    {
        return fArguments;
    }

    std::unique_ptr<Expression> clone(Position pos) const override;

    std::string description(OperatorPrecedence) const override;

private:
    const FunctionDeclaration &fFunction;
    ExpressionArray fArguments;

    using INHERITED = Expression;
};
} // namespace SkSL

#endif
